diff --git a/options-table.c b/options-table.c
index 3d1b4f85..ed9e8a8e 100644
--- a/options-table.c
+++ b/options-table.c
@@ -479,6 +479,14 @@ const struct options_table_entry options_table[] = {
 		  "'User0', 'User1' and so on."
 	},
 
+	{ .name = "forward-unrequested-escseq",
+	  .type = OPTIONS_TABLE_FLAG,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .default_num = 0,
+	  .text = "Whether unrequested escape sequences are forwarded to "
+		  "clients. Can be 'off' (disallowed) or 'on' (allowed)."
+	},
+
 	/* Session options. */
 	{ .name = "activity-action",
 	  .type = OPTIONS_TABLE_CHOICE,
diff --git a/tmux.1 b/tmux.1
index ac9797b5..b6feca76 100644
--- a/tmux.1
+++ b/tmux.1
@@ -4612,6 +4612,11 @@ This respects the
 .Ic base-index
 option if it has been set.
 If off, do not renumber the windows.
+.It Xo Ic forward-unrequested-escseq
+.Op Ic on | off
+.Xc
+If on, when an unrequested escape sequence is received, tmux will forward it to client.
+If off, tmux will ignore it.
 .It Ic repeat-time Ar time
 Allow multiple commands to be entered without pressing the prefix key again
 in the specified
diff --git a/tty-keys.c b/tty-keys.c
index f78b84f2..78c7a8f1 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -1352,8 +1352,10 @@ tty_keys_clipboard(struct tty *tty, const char *buf, size_t len, size_t *size)
 	end--;
 
 	/* If we did not request this, ignore it. */
-	if (~tty->flags & TTY_OSC52QUERY)
-		return (0);
+	if (~tty->flags & TTY_OSC52QUERY) {
+		return options_get_number(global_options,
+		    "forward-unrequested-escseq") ? (-1) : (0);
+	}
 	tty->flags &= ~TTY_OSC52QUERY;
 	evtimer_del(&tty->clipboard_timer);